Thank you David for this Beta! I've found an issue with the dialogs. Dialogs without an OK or Cancel button (S0) don't dissapear when the next dialog sould be displayed.
In the example below the "Wait while bed is heating up to 60C" Message stays until the last S2 Dialog in the last line appears.

I may have spoken too soon about the extruder % adjustment being fixed. While it is not assigning it to T0 all the time like it previously was, it is not just not changing any of them it seems. I've tried adjusting T3 and it always goes back to 100. I can adjust it properly from DWC though.

I am noticing the same issue, I tried adjusting the extrusion % using the Panel Due V2 7", and it is assigning the value to the next extruder, which is rather annoying. I have 4 extruders defined, and I was trying to adjust the extrusion ration – up 10% on T0, and it set it on T1 -- there was no way to adjust it on T0 without using the DWC.